Two types of sockets are in general use: the plastic socket with an expandable liner, and the plastic socket with a medial opening. Both types were designed for easy entry, yet take advantage of the shape of the stump to provide suspension.
Although the end of the stump can take more weight, or load, than in the case of below-knee amputees, it is necessary to shape the upper part of the socket like the PTB so that much of the load can be taken at the knee during walking and standing.
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